Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
120 degree lagged signals can be obtained with the simple configuration shown in the figure....
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...
In the figure we have an application of ON Semiconductor's own semiconductor manual from the 80's....